In this article, we will learn how to reverse entire/complete String in Java 1.8 version using Stream and Collectors

1. Reverse using Java 8’s Stream & Collectors

Initially, we got a String “quick brown fox jumps over lazy dog“
Map entire String into StringBuilder object and at the same time reversing it using reverse() method of StringBuilder class
Finally, collecting reversed String using Stream.collect() method and Collectors.joining() method
We will print both original/reversed Strings along with this length

ReverseCompleteStringUsingJava8.java

package in.bench.resources.count.lines.words;

import java.util.stream.Collectors;
import java.util.stream.Stream;

public class ReverseCompleteStringUsingJava8 {

	public static void main(String[] args) {

		// sample string
		String str = "quick brown fox jumps over lazy dog";


		// reverse a String using Java 8
		String reverseStr = Stream.of(str)
				.map(string -> new StringBuilder(string).reverse())
				.collect(Collectors.joining());


		// print both strings to console
		System.out.println("Original String = " + str);
		System.out.println("Reversed String = " + reverseStr);


		// print both string length to console
		System.out.println("\n\nOriginal String length = " + str.length());
		System.out.println("Reversed String length = " + reverseStr.length());
	}
}

Output:

Original String = quick brown fox jumps over lazy dog
Reversed String = god yzal revo spmuj xof nworb kciuq


Original String length = 35
Reversed String length = 35

2. Reverse using StringBuilder

Initially, we got a String “quick brown fox jumps over lazy dog“
Create StringBuilder object passing above input string as constructor-argument
Then reverse entire/complete String using reverse() method of StringBuilder class
Finally, we will print both original/reversed Strings along with this length

ReverseCompleteString.java

package in.bench.resources.count.lines.words;

public class ReverseCompleteString {

	public static void main(String[] args) {

		// sample string
		String inputStr = "quick brown fox jumps over lazy dog";


		// reverse a String
		StringBuilder resultReverse = new StringBuilder(inputStr);
		String reversedStr = resultReverse.reverse().toString().trim();


		// print both strings to console
		System.out.println("Original String = " + inputStr.trim());
		System.out.println("Reversed String = " + reversedStr);


		// print both string length to console
		System.out.println("\n\nOriginal String length = " + inputStr.trim().length());
		System.out.println("Reversed String length = " + reversedStr.length());
	}
}

Output:

Original String = quick brown fox jumps over lazy dog
Reversed String = god yzal revo spmuj xof nworb kciuq


Original String length = 35
Reversed String length = 35

References:

Happy Coding !!
Happy Learning !!

BenchResources.Net

Java tutorial for beginners

Java 8 – Reverse complete String using Stream and Collectors

1. Reverse using Java 8’s Stream & Collectors

2. Reverse using StringBuilder

References:

Related

1. Reverse using Java 8’s Stream & Collectors

2. Reverse using StringBuilder

References:

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